Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...211.9507g&link_type=abstract
American Astronomical Society, AAS Meeting #211, #95.07; Bulletin of the American Astronomical Society, Vol. 39, p.895
Astronomy and Astrophysics
Astronomy
Scientific paper
The HI content of the newly discovered satellites of the Milky Way has not been previously studied. We use HIPASS (HI Parkes All Sky Survey), LAB (Leiden/Argentine/Bonn), and GALFA (Galactic Arecibo L-band Feed Array) survey data to explore HI in the environment of the newly discovered dwarf galaxies and add this information to what was previously known about HI in the dwarf spheroidal and lower mass dwarf irregular galaxies of the Local Group. All of the new satellites discovered in the Sloan Digital Sky Survey data have limits on their HI masses which range from < 13 M&sun; to 3 x 104 M&sun; except for Leo T, which has an HI mass of approximately 105 M&sun;. We find that galaxies within 300 kpc of the Milky Way or Andromeda are all undetected in HI to low limits, or have ambiguous detections, while those further than 300 kpc are predominantly detected with masses > 105 M&sun;. The most favored explanation for the lack of HI in dwarf galaxies at small galactocentric distances is ram pressure stripping of the gas in the dwarf galaxy by the larger galaxy's hot halo gas. The HI content will also be discussed in terms of the fuel it provides to the Milky Way and the star formation history of the dwarfs. Finally, we discuss the discovery in the GALFA data of discrete HI clouds with dynamical characteristics similar to known dwarf galaxies.
Grcevich Jana
Peek Joshua E. G.
Putman Mary E.
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